Plug-polishing device



June 18, 1929. w, FRASER 1,717,554

PLUG P 0LISHING DEVICE Filed Jan. 21, 1926 INVENTOR ATTORNEY PatentedJune 18, 1929.

FRED w. FRASER, or KANSAS CITY, MissoUR'I,

'ro DIXIE TILLER, FIVE AND ONE-H TWENTY-FIVE PER CENT 'IO RICHARDSO'URI.

ASSIGNOR or THIRTY-TWO run onu'r ALF run onn rrro CHARLES A. sMrrH, ANDN. WAKEFIELD, ALL, or KANsAs orrY, MIS- PLUG-POLISHING DEVICE.

Application filed. January 21, 1926. Serial No. 82,770.

My invention relates to polishing and buffing devices and moreparticularly to a device of this character for polishing plugs of thetype commonly employed in a telephone switchboard, the principal objectof the invention being to provide a convenient means for efficientlypolishingsuch'plugs to remove corrosion or other undesirablenon-conductive coating which may form thereon and interfere with properHow of current through the switch.

It is a further object of the invention to incorporate my improvementsin a motor driven unit, which is easily portable to facilitate its useat a plurality of stations of a telephone exchange or whereverswitchboards are used.

In accomplishing these and other objects of the invention I haveprovided improved details of structure, the preferred forms of which areillustrated in the accompanying drawings wherein Fig. 1 is a perspectiveview of a plug polisher constructed in accordance with my invention,illustrating a plug about to be inserted therein for polishing.

Fig. 2 is a detail perspective view of the polishing head, the eomponent parts of which are shown in spaced relation.

Fig. 3 is a longitudinal, sectional view through the head, particularlyillustrating the polishing disks.

Fig. 4: is a cross sectional view through the head on the line 4-4, Fig.3.

- Referring more in detail to the drawings,

1 designates the polishing head, comprising a barrel2 provided at oneend with a reduced sleeve extension 3 having a central bore 4; of adiameter to the receivethe armature shaft 5 of a motor 6 when the headis applied to the shaft, and provided with set screws 7 and 8 which arethreaded through diametrically opposite openings 9 and 10 intheextension, to engage the shaft and lock the head thereto. The shaft 5is preferably provided with a flattened portion 11 against which the endof one of the screws may contact to provide anchorage for the head.

The bore 12 of the barrel 2 is concentric with, but of greater diameterthan the bore 4 of the extension 3, forming a shoulder 13 at the base ofthe main bore, constituting a stop for the polishing disks 14 which maybe re movably located within said bore and held in I place and againstrotation bya compression ring15 externally threaded to be receivedin theinternally threaded throat 16 at the forward end of the bore. The ringis preferably provided with diametrically opposite recesses 17 and 1 8for receiving a spanner wrench (not shown) by which the'ring may bereadily screwed into place against the polishing disks, or removed tofree the disks when the same are to be replaced.

The polishing disks 1 1 are of a diameter to be received snugly withinthe bore; each disk being preferably composed of a plurality of plies ofcotton fabric or other polishing mate rial stitched together as at 19and provided with a central aperture 20 of slightly less diameter thanthe plug to be polished I In the drawings I have shown the device to bepolished as consisting of an ordinary switchboard plug 21 on its cord22.

In assembling the device, constructed as described, a suflicient numberof disks 14 are slipped into the bore of the barrel to substantiallyfill it. The compressive keeper ring is then screwed into place tocompress the disks against the shoulder and lock themto the head. Thehead is then slipped'upon the motor shaft and the set screws tightenedagainst the shaft to lock the head thereto. A powdered detergentmaterial is then inserted in the apertures of the disks and the deviceis ready for use. The motor may be placed upon the switchboard tableconven ient to the plugs and the motor operated to 1'0? tate the head. Aplug is then pushed into the apertures of the disks which, rotating withthe motor shaft, rub the surface of the plug and remove anyrcorrosion orforeign matter from its surface, so is withdrawn, itsoriginal, polishedand con ductive surface has been restored. I

This operation is repeated with the other I. I

plugs at that position and the outfit-then carthat when the plug ried tothe next position. and so on until all of theplugs at the exchange orotherpllace where the switchboa'rds are employed'have been restored'toserviceablecondition by the polishing described.

WVhen continued. rubbing has worn the disks so that they do not properlycontact the plugs, they may be restored to efiec ti've dimension byprejeetion of the disks into the bore of the barrel by threading thering 17 into the bore, and when the disks have become so .worn as to beincapable of further reduction in interior diameter by the compressionring they may be replaced by new disks.

There is an advantage in employing a plurality of multi-plv disks/inthat the powdered detergent will enter between the disks and between theplugs and be retained for nelfor receiving the article to be polished,and means arranged within the bore for retaining the disks in the bore.

2. In a polishing device a polishing head havinga central bore,compressible polishing disks Within the bore, having aligningarticlereceiving apertures, a' ring threaded into the bore to retain thedisks in position and under compression, and means for rotating thehead.

3. A polishing device comprising a rotatable head having a central bore,polishing disks assembled in the bore, each comprising a plurality ofplies of fabric having concentric apertures whereby the assembled disksprovide a tube-like polishing member, and a compression ring threadedinto the end of the bore to retain the disks in position.

In testimony whereof I afiix my signature.

I FRED Vt. FRASER.

